Publication

Electrochemical promotion of IrO2 catalyst for the gas-phase combustion of ethylene (modeling galvanostatic transients)

Christos Comninellis, György Foti, Ivan Bolzonella
2001
Conference Papers

Abstract

A model for the electrochem. promotion induced by electrochem. generated promoting species is proposed. The formation rate of promoters is assumed to be proportional to the availability of free surface sites at the solid electrolyte/catalyst/gas three-phase boundary, and their spreading out over the gas exposed catalyst surface to be rapid compared to the rate of their consumption. The model predicts exponential catalytic rate transients with current dependent polarization and current independent relaxation behavior. It enables detn. of the max. limiting value of the Faradaic efficiency, being a current independent property of the catalytic system. The validity of the model was confirmed by anodic galvanostatic promotion expts. of ethylene combustion over IrO2/YSZ catalyst at highly oxidative feed conditions. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/c740adbd-7782-4c0a-a921-a0a16c9c99cd

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Christos Comninellis, György Foti, Ivan Bolzonella
2001
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c740adbd-7782-4c0a-a921-a0a16c9c99cd

About this result

Related concepts (32)

Catalytic converter

A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic converters are usually used with internal combustion engines fueled by gasoline or diesel, including lean-burn engines, and sometimes on kerosene heaters and stoves. The first widespread introduction of catalytic converters was in the United States automobile market. To comply with the U.S.

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Catalysis (kəˈtæləsɪs) is the process of change in rate of a chemical reaction by adding a substance known as a catalyst (ˈkætəlɪst). Catalysts are not consumed by the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst.

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The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it. The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions. The chemical reaction is typically a hydrocarbon or other organic molecule reacting with oxygen to form carbon dioxide and water and release heat.

Related publications (1)

Electrochemical promotion of IrO2 catalyst for the gas-phase combustion of ethylene (modeling galvanostatic transients)

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